Laparoscopic sigmoid colectomy with primary anastomosis for experimental modeling in the nonhuman primate.

Laparoscopic colon surgery is performed frequently in the clinical setting for a multitude of reasons including cancer, infection, and autoimmune disease. As a result, extensive research has been conducted in relation to clinical outcomes after surgery, but more recently, in relation to the impact of surgery and other patient factors on physiologic homeostasis including the host microbiome. Despite this, experimental surgical models for laparoscopic colon surgery are scarce in the literature with most studies utilizing rodents.

TREM2 macrophages mediate the beneficial effects of bariatric surgery against MASH.

Background And Aims: For patients with obesity and metabolic syndrome, bariatric procedures such as vertical sleeve gastrectomy (VSG) have a clear benefit in ameliorating metabolic dysfunction-associated steatohepatitis (MASH). While the effects of bariatric surgeries have been mainly attributed to nutrient restriction and malabsorption, whether immuno-modulatory mechanisms are involved remains unclear.

Approach And Result: Using murine models, we report that VSG ameliorates MASH progression in a weight loss-independent manner.

Anastomotic leak occurs independently from microbiota shifts associated with surgical bowel preparation.

Following bowel surgery, infectious complications, including anastomotic leak (AL), remain major sources of morbidity and mortality. Bowel preparation is often administered with the assumption that gut decontamination reduces post-surgical complications. In this study, we tested this hypothesis using a murine model of colon surgery.

The Impact of Surgical Bowel Preparation on the Microbiome in Colon and Rectal Surgery.

Preoperative bowel preparation, through iterations over time, has evolved with the goal of optimizing surgical outcomes after colon and rectal surgery. Although bowel preparation is commonplace in current practice, its precise mechanism of action, particularly its effect on the human gut microbiome, has yet to be fully elucidated. Absent intervention, the gut microbiota is largely stable, yet reacts to dietary influences, tissue injury, and microbiota-specific byproducts of metabolism.

Perioperative Considerations for the Surgical Treatment of Crohn's Disease with Discussion on Surgical Antibiotics Practices and Impact on the Gut Microbiome.

Crohn's disease, a chronic inflammatory process of the gastrointestinal tract defined by flares and periods of remission, is increasing in incidence. Despite advances in multimodal medical therapy, disease progression often necessitates multiple operations with high morbidity. The inability to treat Crohn's disease successfully is likely in part because the etiopathogenesis is not completely understood; however, recent research suggests the gut microbiome plays a critical role.

Diet-induced shifts in the gut microbiota influence anastomotic healing in a murine model of colonic surgery.

Host diet and gut microbiota interact to contribute to perioperative complications, including anastomotic leak (AL). Using a murine surgical model of colonic anastomosis, we investigated how diet and fecal microbial transplantation (FMT) impacted the intestinal microbiota and if a predictive signature for AL could be determined. We hypothesized that a Western diet (WD) would impact gut microbial composition and that the resulting dysbiosis would correlate with increased rates of AL, while FMT from healthy, lean diet (LD) donors would reduce the risk of AL.

Hepatic lipid-associated macrophages mediate the beneficial effects of bariatric surgery against MASH.

For patients with obesity and metabolic syndrome, bariatric procedures such as vertical sleeve gastrectomy (VSG) have a clear benefit in ameliorating metabolic dysfunction-associated steatohepatitis (MASH). While the effects of bariatric surgeries have been mainly attributed to nutrient restriction and malabsorption, whether immuno-modulatory mechanisms are involved remains unclear. Here we report that VSG ameliorates MASH progression in a weight loss-independent manner.

Fecal Microbiota Transplantation for Fulminant Clostridioides Difficile Infection: A Combined Medical and Surgical Case Series.

Urgent abdominal colectomy is indicated for patients with fulminant infection (CDI) when other medical therapies fail, yet mortality remains high. Fecal microbiota transplant is a less invasive alternative approach for patients with fulminant CDI. We report the 30-day complications of patients with fulminant CDI who underwent either abdominal colectomy, fecal microbiota transplantation (FMT), or FMT followed by abdominal colectomy (FMT-CO).

The Influence of the Microbiome on Anastomotic Leak.

Anastomotic leak, defined by the International Study Group of Rectal Cancer as "a communication between the intra- and extraluminal compartments owing to a defect of the integrity of the intestinal wall at the anastomosis," is one of the most devastating complications in colorectal surgery. Much work has been done to identify causes of leak; however, despite advances in surgical technique, the prevalence of anastomotic leak has remained at around 11%. The potential causative role of bacteria in the etiopathology of anastomotic leak was established in the 1950s.

A pilot study demonstrating the impact of surgical bowel preparation on intestinal microbiota composition following colon and rectal surgery.

The intestinal microbiota has been implicated in the pathogenesis of complications following colorectal surgery, yet perioperative changes in gut microbiome composition are poorly understood. The objective of this study was to characterize the perioperative gut microbiome in patients undergoing colonoscopy and colorectal surgery and determine factors influencing its composition. Using Illumina amplicon sequencing coupled with targeted metabolomics, we characterized the fecal microbiota in: (A) patients (n = 15) undergoing colonoscopy who received mechanical bowel preparation, and (B) patients (n = 15) undergoing colorectal surgery who received surgical bowel preparation, composed of mechanical bowel preparation with oral antibiotics, and perioperative intravenous antibiotics.

Implementation and Analysis of an Institution-Wide EHR-Integrated Handoff Note.

EHR-Integrated Handoff Notes are becoming increasingly prevalent, especially among inpatient clinical service teams composed of physicians in training (resident physicians). We describe the implementation of such a tool at our institution, and then describe the usage of the tool, as well as changes made to its content, structure, and format, years after original implementation. We also describe frequency and temporal distribution of updates made to free text elements of the Handoff Note.

Network-based approaches for the investigation of microbial community structure and function using metagenomics-based data.

Network-based approaches offer a powerful framework to evaluate microbial community organization and function as it relates to a variety of environmental processes. Emerging studies are exploring network theory as a method for data integration that is likely to be critical for the integration of 'omics' data using systems biology approaches. Intricacies of network theory and methodological and computational complexities in network construction, however, impede the use of these tools for translational science.

Human Oral Mucosal Stem Cells Reduce Anastomotic Leak in an Animal Model of Colonic Surgery.

Background: Anastomotic leak is regarded as one of the most feared complications of bowel surgery; avoiding leaks is a major priority. Attempts to reduce or eliminate leaks have included alternate anastomotic techniques. Human oral mucosa stem cells (hOMSC) are self-renewing and expandable cells derived from buccal mucosa.

Peri-operative antibiotics acutely and significantly impact intestinal microbiota following bariatric surgery.

Bariatric surgery is the most effective treatment for weight loss. Vertical sleeve gastrectomy (VSG) involves the resection of ~ 80% of the stomach and was conceived to purely restrict oral intake. However, evidence suggests more complex mechanisms, particularly postoperative changes in gut microbiota, in facilitating weight loss and resolving associated comorbidities.

Antibiotic-induced Disruption of Intestinal Microbiota Contributes to Failure of Vertical Sleeve Gastrectomy.

Objective: The aim of this study was to test whether the perioperative composition of intestinal microbiota can contribute to variable outcomes following vertical sleeve gastrectomy (VSG).

Summary Of Background Data: Although bariatric surgery is the most effective treatment for obesity, metabolic outcomes are variable.

Methods: Diet-induced obese mice were randomized to VSG or sham surgery, with or without exposure to antibiotics that selectively suppress mainly gram-positive (fidaxomicin, streptomycin) or gram-negative (ceftriaxone) bacteria on postoperative days (POD) 1-4.

Serum FABP4 concentrations decrease after Roux-en-Y gastric bypass but not after intensive medical management.

Background: Serum concentrations of fatty acid binding protein 4, an adipose tissue fatty acid chaperone, have been correlated with insulin resistance and cardiovascular risk factors. The objective of this study were to assess relationships among Roux-en-Y gastric bypass, intensive lifestyle modification and medical management protocol, fatty acid binding protein 4, and metabolic parameters in obese patients with severe type 2 diabetes mellitus; and to evaluate the relative contribution of abdominal subcutaneous adipose and visceral adipose to the secretion of fatty acid binding protein 4.

Methods: Participants were randomly assigned to intensive lifestyle modification and medical management protocol (n = 29) or to intensive lifestyle modification and medical management protocol augmented with Roux-en-Y gastric bypass (n = 34).

Bariatric Surgery: A Perspective for Primary Care.

Bariatric surgery is the most efficacious treatment for obesity, type 2 diabetes, and other obesity-related comorbidities. In this article, the authors review the current indications for bariatric surgery and discuss the most commonly performed procedures. They analyze medical outcomes of bariatric procedures by reviewing key prospective trials and discuss changes in physiology after these procedures.

National Trends in Bariatric Surgery 2012-2015: Demographics, Procedure Selection, Readmissions, and Cost.

Background: Bariatric surgery is widely accepted as the best treatment for obesity and type 2 diabetes mellitus (T2DM). The Roux-en-Y gastric bypass (RYGB) and the sleeve gastrectomy (SG) have become the predominant bariatric procedures in the USA over the last several years, although the most recent trends in selection are unknown.

Objective: The objective of this study is to assess selection trends, readmission rates, and cost of bariatric procedures in the USA from 2012 to 2015.

Outcomes of Endoscopic Retrograde Cholangiopancreatography (ERCP) and Sphincterotomy for Suspected Sphincter of Oddi Dysfunction (SOD) Post Roux-En-Y Gastric Bypass.

Background: Sphincter of Oddi dysfunction (SOD) is thought to be a cause of chronic abdominal pain post Roux-en-Y gastric bypass, and current practice of performing endoscopic retrograde cholangiopancreatography (ERCP) with or without sphincterotomy is not supported by evidence. In addition to the complexity and risks of the procedure in patients with Roux-en-Y anatomy, the outcomes are uncertain and debatable. We performed a retrospective review and analysis of post-gastric bypass patients who had undergone ERCP with sphincterotomy to determine the effectiveness in patients with suspected SOD.

Sleeve gastrectomy drives persistent shifts in the gut microbiome.

Background: Changes in the gut microbiome following bariatric surgery have been causally linked to metabolic benefits.

Objectives: We sought to characterize and assess the stability of gut microbiome shifts following sleeve gastrectomy (SG).

Setting: University laboratories.